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    2019, Volume 26 Issue 3
    25 May 2019
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    2019, 26(3): 0-0. 
    Abstract ( 119 )   PDF (720KB) ( 215 )  
     
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    2019, 26(3): 0-0. 
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    A discussion on high-quality development and sustainable utilization of China's urban underground space in the new era. 
    WANG Chengshan,ZHOU Chenghu,PENG Jianbing,FAN Jie,ZHU Hehua, LI Xiaozhao,CHENG Guanghua,DAI Chunsen,XU Nengxiong
    2019, 26(3): 1-8. 
    DOI: 10.13745/j.esf.sf.2018.9.2

    Abstract ( 404 )   PDF (1385KB) ( 454 )  
    Development and utilization of urban underground space and exploration of new resources for urbanization are two important ways for solving city problems, improving urban ecological environment, optimizing urban spatial structure and strengthening urban resilience. In this paper, we analyzed the current development and utilization of urban underground space in China and identified problems that need urgent solutions. The problematic areas include aggressive development lacking overall supply, fragmented utilization without cooperative planning, passive response without strong technological support, and disorderly management compounded by inadequate laws and regulations. The current predicament can be remediated through comprehensive legislation, careful planning, preparatory investigation, intelligent management and scientific research support. We propose five specific countermeasures, i.e. investigate and evaluate urban underground space comprehensively; establish a cooperative planning system for underground space as soon as possible; accelerate the construction of an intelligent underground space management system; design a technological development strategy for underground space with high priority; and improve laws and regulations for urban underground space as early as possible. These countermeasures will promote rapid development in Chinas underground space industry, science and technology and underground space system, setting up a global model for sustainable development and utilization of urban underground space resources.
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    Geological structural classification of and geological survey method for urban underground space in China
    PENG Jianbing,HUANG Weiliang,WANG Feiyong,LIU Yang
    2019, 26(3): 9-21. 
    DOI: 10.13745/j.esf.sf.2019.5.34

    Abstract ( 516 )   PDF (6510KB) ( 413 )  
    The development and utilization of urban underground space are reasonable strategies conforming to the law of urban development, and China has seen rapid expansion of underground development in urban construction in recent years. China has a vast territory with various types of cities distributed in various geomorphological regions. Therefore, before large-scale development, the underground space of various cities should be classified according to geological conditions to ensure that a geostructural engineering classification system can be established to guide engineering practice. Here, we classified 49 cities according to geomorphologic location, regional tectonic and lithospheric structural characteristics, current seismic activity, basement and soil structure, underground water depth and so on. Choosing the geomorphologic location as the top division unit, we can classify the tectonic environment, crustal and mantle characteristics, basement structure and surface fault activity and potential seismic source zone, as well as soil type and solid structure of surface rocks, in the same division unit for various cities. Classification of urban underground space is based on fine exploration of underground space. We summarized here the current methods for underground geostructural investigation including ground surface mapping, exploratory drilling, geophysical survey and model building. However, new methods and theories are still needed for conducting fine exploration of all elements in a structural system in complex geological environment and in deep underground space development. Breakthroughs are also expected in construction theory and descriptive method for different types of urban geostructural models. And the classification system and classification method for the geostructures of urban underground space also need to be further improved.
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    Issues and challenges in urban underground space utilization in China
    ZHU Hehua,DING Wenqi,QIAO Yafei,WANG Xin,HAN Chuanfeng, ZHANG Dongmei,LI Xiaojun
    2019, 26(3): 22-31. 
    DOI: 10.13745/j.esf.sf.2019.4.19

    Abstract ( 467 )   PDF (2507KB) ( 351 )  
    Although the scale and expansion speed of urban underground space utilization (UUSU) in China rank first in the world, a series of challenging issues still need to be resolved urgently. In this paper, based on our investigation of UUSU in different Chinese cities and the experience of other countries, we summarized these issues into four categories: management, technology, operation and maintenance, and human resources. In management, lack of guidelines and without a comprehensive management agency, China is facing challenges to establish an UUSU management system that can meet its needs. In technology, further improvements are needed in controlling construction disturbance in complex geological environment. Without advanced modern equipment while deep UUSU just begins, it can be challenging to design a versatile technological system based on development and conservation principles. In operation and maintenance, a comprehensive technical system needs to be developed for UUS infrastructure maintenance and escape-rescue operation. Management and utilization of UUS monitoring data is still in the initial stage, therefore, building a digital and intelligent operation/maintenance system can be challenging but is in urgent need. Lastly in human resources, strengthening investment in UUS engineering discipline will ease the shortage of all-around UUS engineers. Also a sound educational system is urgently needed to meet the demand for qualified UUS technicians.
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    Prediction of strategic demand of urban underground space development
    LI Xiaozhao,WANG Rui,GU Qian,ZHOU Dankun,XIN Yunxiao
    2019, 26(3): 32-38. 
    DOI: 10.13745/j.esf.2019.03.004

    Abstract ( 257 )   PDF (1717KB) ( 312 )  
    The development and utilization of urban underground space resources is an inevitable choice of China's urbanization strategy. In this report, we first discussed various factors that affect urban underground space development in China, and analyzed the effects of these factors and the domestic demand of urban underground space resources based on current developmental status. Then we identified the influential factors using analytic hierarchy process (AHP) method from the perspective of demand for per capita underground space in different developmental stages. Through determination of future demand levels and population capacity by city size, we calculated the total population and per capita demand by city size and predicted the scales of China's underground space developments in 2030 and 2050.
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    Present situation and developmental trend of urban underground space development and utilization in China
    CHENG Guanghua,WANG Rui,ZHAO Muhua,SU Jingwen,YANG Yang,ZHANG Xiaobo
    2019, 26(3): 39-47. 
    DOI: 10.13745/j.esf.sf.2019.4.20

    Abstract ( 1797 )   PDF (1452KB) ( 572 )  
    During urbanization, “urban diseases” is a problem for most cities, and utilization of urban underground space has become an effective way to solve this problem. In this context, the utilization of urban underground space in China has enter an era of rapid development since the dawn of the 21th century with great achievements made over the past decade. Here, we first summarized the development of underground space with different functions and described the current situation of underground space utilization at several levels in different types of Chinese cities. We then put forward the trend of Chinas urban underground space development and utilization towards scientific utilization of urban underground space resources, providing full social and economic benefits and making cities more beautiful. Each city will focus on the function of its underground space according to its societal and economical needs as well as its geological environmental characteristics.
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    Current status, trend and revelation of worldwide urban underground space development and utilization
    ZHANG Bin,XU Nengxiong,DAI Chunsen
    2019, 26(3): 48-56. 
    DOI: 10.13745/j.esf.sf.2019.5.20

    Abstract ( 293 )   PDF (3820KB) ( 330 )  
    The development of urban underground space is an important measure of alleviating the problem of “urban diseases”. Europe, the United States and other developed regions have gained rich experiences and learned their lessons in developing underground space. Through our investigation of major cities around the world, we summarized the current status of worldwide urban underground space development and analyzed the future directions to guide Chinas own development. Currently, the world has established a development model aiming at relieving urban traffic congestion, expanding urban living space, creating efficient cities and constructing a comfortable and livable urban environment. And the future development trend is to build a green, intelligent three-dimensional city. China should learn from the experience of other countries and develop its urban underground space efficiently according to its own cities characteristics.
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    Current situation and existing problems of and coping strategies for urban underground space planning in China
    PENG Fangle,QIAO Yongkang,CHENG Guanghua,ZHU Hehua
    2019, 26(3): 57-68. 
    DOI: 10.13745/j.esf.sf.2019.5.23

    Abstract ( 1383 )   PDF (3128KB) ( 407 )  
    Underground space planning is required for sustainable and systematic development of urban underground space (UUS). With rapid development of urban rail transit system and the introduction of related policies, UUS utilization will certainly see a booming future, and UUS planning will become increasingly important. Across China, a basic technological framework for UUS planning is emerging but various issues still need to be resolved. Therefore, it is important to have a clear understanding of the current UUS planning status and recognize existing problems and solutions to ensure a sustainable urban development.
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    Status and challenges of underground space development and utilization in China based on comparative analysis of typical Chinese cities. 
    YANG Xiaogang,WANG Rui,HUANG Weiliang
    2019, 26(3): 69-75. 
    DOI: 10.13745/j.esf.sf.2019.5.21

    Abstract ( 397 )   PDF (1247KB) ( 302 )  
    Based on our investigation of development and utilization of underground space in eight typical Chinese cities, including Beijing, Shanghai and Chengdu, we demonstrated that China is currently undergoing rapid and efficient underground space development. However, problems such as lack of coordination, shallow depth and small scale of development, imperfect planning system and inadequate management system still pose challenges. Compared with the developmental trends in foreign developed cities, we propose that China should continue enhancing urban geological survey, improving underground space planning system, strengthening operational management system and improving information sharing in developing its urban underground space.
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    The critical issues and creative concepts in the development of urban underground space
    HU Zhiping,PENG Jianbing,ZHANG Fei,WANG Rui,CHEN Nannan
    2019, 26(3): 76-84. 
    DOI: 10.13745/j.esf.2019.03.009

    Abstract ( 250 )   PDF (2721KB) ( 293 )  
    One of the important approaches to promote sustainable development of cities is the development of urban underground space. This approach has several significant benefits, including increasing urban land utilization ratio, expanding urban volume ratio, enhancing urban carrying capacity and alleviating urban diseases such as traffic congestion, environmental pollution, flood disaster and so on. Here, we summarized the main problems and hazards in the urban underground space development process. We also analyzed the current critical issues related to underground and geological structures such as the multi-field coupling mechanism between geological structural elements, the dynamic mechanism of geological structural system, the interaction mechanism between geological and underground structures, the catastrophe and dynamic evolution mechanisms of underground structures, and the disaster prediction and dynamic regulation mechanism of underground space engineering. These critical issues are being examined and need further exploration in the future. Finally, based on the above analyses, we suggested the corresponding creative concepts, which include research on multi-field coupling mechanism, decryption of triggering and evolutionary mechanisms, and establishment of theory of early warning system. This study presents a wide range of research possibilities for future underground space development.
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    Issues and challenges in the development of urban underground space in adverse geological environment
    HUANG Qiangbing,PENG Jianbing,WANG Feiyong,LIU Nina
    2019, 26(3): 85-94. 
    DOI: 10.13745/j.esf.sf.2019.5.35

    Abstract ( 402 )   PDF (4587KB) ( 335 )  
    The geological environment is complex and adverse geological conditions such as land subsidence, ground fissures, active faults and karst are common in China. And China is one of the countries most prone to serious geological disasters in the world, which brings unprecedented challenges to Chinas current large-scale development of urban underground space,especially in the constructions of urban underground transient system and comprehensive pipe gallery. In this paper, we describe the distribution, developmental status and engineering hazards of the aforementioned adverse geological environments in China. We point out clearly the issues and challenges facing the underground space development and utilization in these hazardous environments, such as lack of systematic monitoring, lack of theoretical methods and technical support for evaluation and safe usage, unknown mechanism of interactions between adverse geological conditions and underground space, and lack of foresight based planning. We suggest that theories and methods should be developed as soon as possible for assessing the suitability of urban underground space development and utilization in adverse geological environments. Plan and design theory, detection and monitoring techniques, and key technologies for evaluation, safe usage and hazard prevention for urban underground space resources also need to be developed urgently. This study provides important scientific basis and technical guidance for the development, utilization and safe operation of underground space in the aforementioned adverse geological environments.
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    Whole life-cycle risk analysis and construction of prevention and control system for urban underground space
    ZHAI Yue,ZONG Yanyan,HOU Yanan,LIU Yi,LI Yubai
    2019, 26(3): 95-103. 
    DOI: 10.13745/j.esf.sf.2019.5.36

    Abstract ( 283 )   PDF (3531KB) ( 216 )  
    Accidents occur frequently and can cause great harm during a course of urban underground space exploitation and development. In order to effectively reduce accident occurrences and losses, we identified the main risk factors in project planning and site selection, hydrogeological exploration, engineering design, construction, and late operation and maintenance during the whole life-cycle of the project, and analyzed the potential accidents. We demonstrated the common relationships among the risk factors in the aforementioned areas, established a safety evaluation index system, proposed a comprehensive multi-factor/multi-method safety evaluation model, and carried out feasibility verification through specific examples. On this basis, we developed a “whole life-cycle, whole-system and whole-organization” orientated risk prevention and control technology and management system. We provided in this paper the reasonable ideas and methods for ensuring successful implementation of urban underground space projects.
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    Study on the stratified system in urban underground space development
    XIN Yunxiao,LI Xiaozhao,DAI Jialing,WANG Rui
    2019, 26(3): 104-112. 
    DOI: 10.13745/j.esf.sf.2019.5.17

    Abstract ( 394 )   PDF (1786KB) ( 253 )  
    In order to unify the standards of the underground stratification system, this paper collected the related data of underground stratification requirements for major domestic and international cities, and analyzed the main natural and social factors for the urban underground space development. The main natural factors are terrain, geomorphology and engineering geology distribution, which determine difficulties and costs of underground space development. The main social factors are city scales, location conditions, and local policies and regulations, which determine demands for underground space. The results show that regional demands and difficulties in development determine the development scales, which in turn affect the underground stratification. In most cities, the underground space is divided into shallow, sub-shallow and deep layers that are separated at 15 m and 30 m depths, respectively. The shallow underground space is greatly influenced by topography and geomorphology and should be stratified in the sub-shallow region. The underground space should be layered along the normal of the ground surface in the steep slope area. Based on them, this paper established a hierarchical evaluation index system for underground space, which provided a certain guidance and reference significance for urban underground space planning.
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    Key points in managing and constructing under crossing projects in airfield area
    QIAO Yafei,DING Wenqi,LU Xingbang,SI Bifeng,CHAI Zhenlin, ZHU Hehua,GONG Chenjie,TANG Tao
    2019, 26(3): 113-121. 
    DOI: 10.13745/j.esf.sf.2019.4.23

    Abstract ( 206 )   PDF (2045KB) ( 140 )  
    The rapid development of civil aviation industry in China has led to the increased demand for underground space in airfield areas, especially under crossings to connect different functional zones. We summarized here the key points in managing, planning and constructing under crossing projects in airfield areas based on our investigation and analyses of several such projects. In project managing, it is necessary to establish a safety management system throughout the life of the project in terms of safety risk management and complying with regulations for non-stop construction or construction in forbidden zones. In planning, the balances between short- and long-term planning, use of ground and underground space, development and conservation should be considered. The organization and layout of the functional zones in the airfield area should determine the layout and scale of the underground crossing. Finally in constructing an under crossing project, the deformation control value for under crossing construction should first be established based on the requirements of airfield operation, followed by use of fine design, micro-disturbance construction and high precision monitoring to balancing safety and economy, with implementation of the sub-zone, sub-stage and sub-grade control rule. These key points may in general guide under crossing construction projects in airfield area.
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    Avoidance of underground construction in regions of buried active normal faults: taking the Xianyang segment of the Weihe fault as an example
    WANG Jiachen,WANG Youlin,LI Xiaozhao,DU Shaoshao,ZHOU Dankun, XIN Yunxiao,WANG Rui
    2019, 26(3): 122-128. 
    DOI: 10.13745/j.esf.sf.2019.5.22

    Abstract ( 189 )   PDF (1507KB) ( 230 )  
    The influence of active faults on urban construction has long been emphasized by researchers and urban builders, such that the determination of avoidance distance directly affects the selection of building locations in regions of buried active normal faults. With the rapid development of underground space in China, the challenges of underground building selection have emerged. In view of the situation and taking buried active normal faults as an example, we analyzed the influence of earthquake damage in underground buildings, the geological background, fracture activity, and the characteristics of earthquake damage in active fault regions. We then determined the setback distance of underground buildings in these regions. We concluded as follows: Firstly, the impact of seismicity of underground buildings from active faults is smaller than that of the ground construction, but the impact of earthquakes should still be considered carefully. Secondly, the failure range of buried normal faults is influenced by many factors, and the delimitation of the avoidance distance of underground structures should be based on the boundary of the fault deformation zone. Lastly, based on the geological background and fracture activity characteristics of the Weihe fault in the Xianyang Region, the setback distances of the upper and lower walls are 30 and 15 m, respectively. Therefore, the limited construction belt is 140 m wide within 30 m depth.
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    Study of the shear wave velocity structure of underground shallow layer of Jinan by ambient noise tomography
    LIANG Feng,GAO Lei,WANG Zhihui,LI Hailong,LIU Kai,WANG Tao,LI Xiaozhao
    2019, 26(3): 129-139. 
    DOI: 10.13745/j.esf.sf.2019.5.18

    Abstract ( 241 )   PDF (5105KB) ( 231 )  
    Urban geophysical exploration often requires innovative thinking or sometimes seemingly off-the-wall approaches to meet data challenges of urban environment associated with human sprawl, such as moving vehicles, dense power grids, jagged buildings and so on. Therefore, the China Deep Exploration Center (CDEC, formerly SinoProbe Plan Center) officially launched the government-lead geological survey of urban underground space resources (also named “urban underground space-exploration project”) in pilot cities. One of the principal aims of the project is to develop geophysical characterization techniques that are accurate and noninvasive, and can be adapted to noisy and culturally complex urban settings. We selected Jinan city in Shandong Province as the first pilot city for both its great demand of underground infrastructure including a metro-subway system and its unique subsurface geology. In this pilot study, we seek a geophysical methodology that can meet urban challenges, such as noisy environment, large urban areas, restriction for equipment deployment, and logistics dealing with paved surfaces and roads. We applied ANT (ambient noise tomography) to a dense short-period array and obtained good results: (1)Using high-frequency waves generated by ambient noise tomography, we obtained surface waves with good signal-to-noise ratio after processing continuous ambient noise data collected from 49 broadband seismic stations for 32 days, demonstrating that ANT method is suitable for exploring background rock structures in urban underground space. (2)Using direct surface-wave tomographic method with period-dependent ray-tracing, all surface-wave dispersion data were inverted in the 0.21.5 s period band simultaneously for 3D variations of shear-velocity structure. The shear-velocity structure correlates well with the geological features and general lithological distribution of igneous and limestone rocks, as well as the spatial distribution of faults at depth. (3)Shear-velocity obtained from the inversion showed that the lateral and vertical velocity variation is much bigger. Specifically, in shallow regions at above 300 m depth, the lithological characters are mainly of limestone (higher shear-velocity), with much wider distribution, and of magma intrusion (highest shear-velocity relative to limestone); an obvious boundary between low and high shear-velocity indicates a concealed fault at the study area; and extensive magma intrusion occurs at greater depth whereas limestone exists only in the middle part of the north region. Overall, the study results proved that our method can be effective in helping us to better understanding local geologic structures, evaluating lithological distributions and assessing hazardous concealed active faults and their effects on springs in the future.
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    Analysis of relationship between underground space percolation and fracture properties
    DONG Shaoqun,WANG Tao,ZENG Lianbo,LIU Kai,LIANG Feng, YIN Qihang,CAO Dongsheng
    2019, 26(3): 140-146. 
    DOI: 10.13745/j.esf.sf.2019.4.22

    Abstract ( 189 )   PDF (3082KB) ( 245 )  
    Evaluation of fracture network connectivity is an important part of studying the underground space while percolation analysis is an effective way to examine the connectivity of a fracture network. Percolation threshold of a fracture network is typically determined by indirect characterization parameters of fractures (eg., fractal dimension). However, fracture networks with different connectivity may have the same indirect characterization parameters, leading to decreased prediction reliability. To avoid this problem and to more accurately and quickly characterize fracture network connectivity, we built percolation threshold equations using direct characterization parameters (e.g., fracture length and number) by nonlinear fitting instead of using indirect characterization parameters in the simplified approach. The equations were drawn from the relationships between percolation thresholds and direct characterization parameters of different two-dimensional discrete fracture networks; application of these equations in different scaled fracture networks was discussed and validated. The results show that these equations can efficiently predict percolation thresholds of different scaled fracture networks. Based on this result, we developed criteria for estimating connectivity of fracture networks, which provide certain guidance and reference point for the evaluation of underground space in fractured areas.
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    Studies of indoor environmental characteristics of and design ideas for urban underground space: taking the Xi'an SAGA International Shopping Center as an example
    LUO Jing,ZHANG Wei,HU Zhiping,CUI Wenwen,WANG Jihao
    2019, 26(3): 147-153. 
    DOI: 10.13745/j.esf.sf.2019.4.21

    Abstract ( 489 )   PDF (3801KB) ( 232 )  
    Rapid urbanization in China has led to the continuing expansion of urban space and population, causing growing problems of urban traffic congestion, environmental pollution and increasingly scarce land resources. Since urban underground space is an important part of urban resources, proper development of underground cities may alleviate these problems to some extent. In this report, we briefly described the current status of urban underground space development and utilization in China and the types of urban underground space applications, and analyzed the characteristics of the internal environment of underground space such as constant temperature, heat insulation, high humidity, poor air circulation, insufficient natural lighting, lack of natural landscape and ecological support, etc. Taking the Xi'an SAGA International Shopping Center as an example, we then summarized the key concepts and procedures in underground complex interior design using natural and artificial lighting, plant water and interface design. Finally, we proposed the following optimization ideas on urban underground commercial space interior design: (1) Design clear spatial layout that conforms to human spatial cognition habit; (2) Introduce natural lighting through entrance expansion or modern technology; (3) Use artificial lighting that simulates natural lighting; (4) Introduce natural elements to achieve natural transition between indoor and outdoor environments and create open and vibrant underground space to alleviate human psychological and physiological barriers; (5) Design variable dimensions of underground space conforming to human scale to avoid discomfort; (6) Pay attention to people of reduced mobility and set up no-barrier access ways; (7) Set up ample rest areas; and (8) Encourage local design ideas to reflect regional cultural characteristics.
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    Tectonic characteristics and kinematic significance for the global mid-ocean ridge system
    LI Jianghai,LIU Chiheng,HAN Xiqiu
    2019, 26(3): 154-162. 
    DOI: 10.13745/j.esf.sf.2019.5.8

    Abstract ( 283 )   PDF (3511KB) ( 569 )  
    In this paper, we divided the global mid-ocean ridge into internal and external ridge systems, according to the global distribution and kinematics characteristics of mid-ocean ridges and their structural and geometric relations with Pangaea at the period of their initial formation. The external ridge system, originated from the interior of Panthalassa and the Gondwana continent, starts at the Explorer Ridge, runs through the East Pacific Rise, the Southeast Indian Ridge, the Central Indian Ridge and the Gulf of Aden, and ends at the Red Sea. The internal ridge system, on the other hand, originated from the interior of the supercontinent Pangaea, extends from the Southwest Indian Ridge to the Mid-Atlantic Ridge, the Reykjanes Ridge, the Mohns Ridge, and ends at the Gakkel Ridge. The balance of global plate tectonics is achieved through the subduction-orogenic belt and diffuse plate boundaries between these two ridge systems to keep the spherical geometry of the Earth constant. The external ridge system has global tectonic significance. It is directly involved in the creation and development of the Pacific oceanic basin and  extinction of the ancient Pacific plate. In contrast, the internal ridge system caused continuous expansion of the Atlantic and Indian oceanic basins since the Mesozoic. Also since the Mesozoic, the external and internal ridge systems are collectively responsible for the lithosphere shortening in the subduction or orogenic belt of the western Pacific and northern Tethys by the ridge expansion.
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    Origin and controversy of the term “软玉(RuanYusoft jade)” and a proposal to remove the word “软(Ruansoft)” from “RuanYu”
    SHI Guanghai,ZHANG Xiaochong,XU Lin,LI Xinling
    2019, 26(3): 163-170. 
    DOI: 10.13745/j.esf.sf.2019.5.25

    Abstract ( 374 )   PDF (1491KB) ( 195 )  
    The term “RuanYu”(written as软(軟)玉 in Chinese) has a literary meaning of “soft jade”, which is equivalent to nephrite in some literature. The term has become highly controversial recently. Arguments against it came from Chinese archaeologists and gemologists. Archaeologists argue that “RuanYu” has never been used in China at least until the end of the Qing Dynasty; in addition, the gemstone is not soft at all. Gemologists further point out that the hardness of Chinese jade material, mainly composed of tremolite-actinolite, exceeds those of glass and iron, with no wearing scratch on its surface after long term use. Then why Chinese jade is called “RuanYu”? Since jade has been traditionally loved and well respected in China, and jade culture is an important component of the Chinese culture, we believe that it is of great significance that we should clarify this controversy by finding the origin of this term. In this study, we summarized the history of the term “RuanYu” by extensive researching of relevant references around the world. Our study shows that the word “Yu(玉)” has been used to describe the jade material in China since ancient times. The term “RuanYu”, on the other hand, first appeared in the book titled “The Mineral Names: English, German and Japanese”, published in 1890 in Japan, by Koto where he translated the English word “Nephrite” to “軟玉(Yuan Yu)” for the first time. Previously since 1846, however, “nephrite”(appeared roughly in the 16th century or later in the West) had been used to describe the main mineral of ancient jade from China. In 1921, The term “RuanYu” was first introduced to China by Chinese scholars studying in Japan, and later appeared in many mineral-related books in Chinese. In 1996, the term was listed as a Chinese gemstone name in the Gems-Testing National Standard, and continues its use till now. From this summarized history, one can see that in 1890, when China was suffering from war, poverty and backwardness, and looted jade artifacts were brought out of China in large quantity, a modifier “軟(Ruansoft)” was added to 玉(Yuthe traditional Chinese name for jade) by a Japanese author to ascribe to “nephrite”. We consider the adaptation of the term “RuanYu”, which is not of Chinese origin and was not used traditionally by Chinese people, inappropriate. We recommend that the traditional Chinese name “玉(Yu)” be used for tremolite jade to avoid problems the term “RuanYu” may imply. Although the jade used in the early period of China had various types, however, tremolite jade has been dominant since the Western Zhou Dynasty. By restoring the name “Yu” to describe Chinese jade, we restore the name consistent with Chinese history and cultural tradition.
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    Zircon U-Pb age and Lu-Hf isotope characteristics of the granitic augen gneiss from the Longquanguan shear zone, and their geological significance
    WANG Meng,QIAN Jiahui,ZHANG Jinjiang,ZHANG Bo
    2019, 26(3): 171-182. 
    DOI: 10.13745/j.esf.sf.2018.12.12

    Abstract ( 150 )   PDF (2996KB) ( 213 )  
    The Hengshan-Wutai-Fuping area, located in the middle part of the Trans-North China Orogen with large outcrop of Precambrian rocks, is becoming an ideal place to reveal the early-phase evolutionary history of the North China Craton. The Longquanguan shear zone situated in the junction area of the Wutai and Fuping Complex, and the main rock types are granitic augen gneiss and amphibolite. We conducted LA-ICP-MS zircon U-Pb dating and Lu-Hf isotope analysis for the granitic aguen gneiss from the Longquanguan shear zone. The protolith of the Longquanguan granitic aguen gneiss was crystallized at 2547±7 Ma, with εHf(t) values from +2.7 to +9.2, indicating that the rocks were derived from relatively juvenile continental crust with similar features of the late Archean granitic rocks from the Wutai complex. According to the two-stage Hf model, the zircon ages from the Longquanguan granitic augen gneiss varied from 2872 to 2477 Ma and peaked at 2.58 Ga, 2.71 Ga and 2.81 Ga, coinciding with the Neoarchean continental crustal growth events of the North China Craton.
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    Zircon SHRIMP U-Pb age of the Chuanlinggou Formation of the Changcheng Group, North China and the stratigraphic implications
    LIU Dianbo,WANG Xiaolin,ZHANG Heng,SHI Chenglong
    2019, 26(3): 183-189. 
    DOI: 10.13745/j.esf.sf.2018.12.6

    Abstract ( 188 )   PDF (2500KB) ( 277 )  
    The Yanliao area in the North China Craton (NCC) represents a standard section of Meso-Neoproterozoic sedimentary strata of NCC. The Jixian and Qingbaikou Groups have gained a substantial amount of important high accuracy dating data. However, reliable high accuracy dating data are still lacking for the Changcheng Group, except for the Dahongyu Formation at the top of the group. Here, in order to accurately determine the geological age of the Mesoproterozoic Chuanlinggou Formation of the Changcheng Group, we collected samples of volcanic tuff rocks from the upper part of the Chuanlinggou Formation in the Shenxianling Section, Kuancheng County, Hebei Province and performed zircon SHRIMP U-Pb dating at the Beijing SHRIMP Center. The zircon dating yielded a weighted mean 207Pb/206Pb age of 1634.8±6.9 Ma (95% confidence, MSWD=1.2, n=23), which, we conclude, is the age of the upper part of the Chuanlinggou Formation. It is suggested, therefore, that the Changcheng Group, from the Chuanlinggou Formation to Dahongyu Formation as a whole, belongs to Mesoproterozoic strata.
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    Geochemical characteristics and sedimentary environmental implications of the Late Jurassic siliceous rocks in the Changlin Formation, Huangtang section, Fujian Province
    ZHANG Jinhu,JIN Chunshuang,XU Liming,WANG Hairong,YANG Yuru, DENG Ke,GAO Yongjin,WU Zhaojian
    2019, 26(3): 190-201. 
    DOI: 10.13745/j.esf.sf.2018.10.2

    Abstract ( 165 )   PDF (5832KB) ( 156 )  
    The Changlin Formation in the Huangtang area, Fujian Province developed bedded siliceous rocks consisting of thin-layered tuff and producing siliceous sponge spicules and siliceous calcareous algaes. The sedimentary environment of the siliceous rocks is complex and their origin is still under debate. Here, based on our field geological survey and petrographic study, as well as analyses of major elements, rare earth elements and trace elements, we show that the siliceous rocks have similar phase behavior as non-hydrothermal siliceous rocks in the Fe-Mn-Al diagram. Moreover, findings of enrichment of Mo, V and LREEs, weak negative Eu anomalies and U/Th values concur with typical biogenic characteristics, while microscopic characteristics show influence of volcanic activity. In the major element discrimination diagrams including Fe2O3/TiO2Al2O3/(Al2O3+Fe2O3), TFe2O3/(100SiO2)Al2O3/(100SiO2) and (La/Ce)NAl2O3/(Al2O3+Fe2O3) diagrams, the siliceous rocks are consistent with continental shelf. Geochemical indicators such as high ΣREE value and values of Ceanom, MnO/TiO2 and (La/Yb)N, all indicate that the siliceous rocks deposited in the shallow sea continental shelf under anoxic condition, affected by terrigenous material in the Huangtang area. Combining other researchers work, we believe that transgression in the study area began in the Late Jurassic accompanied by small-scale volcanic activities in an overall reducing environment, producing isolated deep water areas. Our research may guide future developments in petroleum geology assessment of prospective regions in Fujian and Zhejiang Provinces. 
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    Compositional characteristics of pyrite ore formed in the main metallogenic period of various types of hydrothermal gold deposits
    LI Hongliang,LI Guangming
    2019, 26(3): 202-210. 
    DOI: 10.13745/j.esf.sf.2019.3.5

    Abstract ( 202 )   PDF (1595KB) ( 323 )  
    Pyrite ore, a product of metallogenic hydrothermal activity, is one of the most important gold-bearing ores in hydrothermal gold deposits, with a wealth of genetic information recorded in its chemical composition. Based on the classification and summary of key geological features of different types of hydrothermal gold deposits, and adopting the research methodology of comparative metallogeny, we systematically analyzed the compositional characteristics of major and trace elements and their combinations and that of (Fe+S)-As, δFeδS, As-Co-Ni, as well as thermoelectricity of pyrite ore formed during the main metallogenic period of various gold deposits or by co-deposition with gold. The results show that the chemical compositions of pyrite ores from different type of hydrothermal gold deposit are significantly different, and the compositional characteristics can be used to identify the genesis of hydrothermal gold deposits. We also proposed that hydrothermal gold deposits are ideal objects for studying continental dynamics when tectonic settings are also taken into consideration. Through these studies, we established preliminarily a coupling relationship between geological features and compositional characteristics of pyrite ore. This relationship will help future identification of the the genesis of hydrothermal gold deposits and further typomorphic characterization of pyrite ores.
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    Genetic mechanism of overpressure in the Paleogene and Neogene in the northwestern Qaidam Basin
    LIU Chenglin,PING Yingqi,GUO Zeqing,TIAN Jixian,HONG Weiyu,ZHANG Wei,HUO Junzhou
    2019, 26(3): 211-219. 
    DOI: 10.13745/j.esf.sf.2018.9.4

    Abstract ( 166 )   PDF (3043KB) ( 168 )  
    Overpressure is considered prevalent in the northwestern Qaidam Basin. Understanding the spatial distribution and genetic mechanism of overpressure is key to the evaluation of hydrocarbon accumulation conditions and resource potential of the region. Here, we analyzed the plane and section distribution characteristics of the areas abnormal high pressure based on the measured pressure and pressure calculated by the equivalent depth method. Combining the time-difference curve of acoustic wave of mudstone, deposition rate, lithologic characteristics, hydrocarbon generation potential of organic matter and tectonic compression, we quantitatively evaluated the genetic mechanism of overpressure. The results showed that the initial depth of overpressure in the area was about 1500 m, developed mainly in the Lulehe to upper Ganchaigou Formations of the Miocene and with abnormally high pressure increasing with depth. In general, undercompaction, organic matter generation and tectonic compression were important factors for overpressure formation and evolution. The results showed that, in the northwestern Qiandam Basin, undercompaction was the most important controlling factor, with a contribution rate of up to 60%; the contribution from tectonic compression came in second at about 20%30%; and the contribution from organic matter generation was the least. Moreover, the salinity characteristics of the northwestern Qaidam Basin indicated that the formation of the overpressure was also affected by both pore fluid salinity and the salt-bearing plastic layer deposited in the salt-brackish water environment.
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    Analyses of the characteristics and main controlling factors for the micro/nanopores in Niutitang shale from China's southeastern Chongqing and northern Guizhou regions
    ZENG Weite,DING Wenlong,ZHANG Jinchuan,LI Yuxi,WANG Ruyue, JIU Kai
    2019, 26(3): 220-235. 
    DOI: 10.13745/j.esf.sf.2018.10.1

    Abstract ( 148 )   PDF (9395KB) ( 158 )  
    We performed nitrogen adsorption isotherm and scanning electron microscopy (SEM) analyses on core and fresh outcrop samples of Niutitang shale from the southeastern Chongqingnorthern Guizhou region, which allow us to classify the micro/nano scale pore types and quantify the pores developmental stages and morphological structures. In addition, we carried out qualitative or semi-quantitative geochemical analysis on the controlling factors for the micro/nanopore development. The results show that the micro/nano scale pores in Niutitang shale can be divided into 3 types (including 7 subtypes): organic and inorganic pores and micro fracture. Structurally, the organic pore features spherical fine neck and ink bottle, the inorganic pore has bead, sphere and wedge features, and the micro fractures develops parallel plates with four-side opening and splint structures. The organic and intergranular pores and micro fracture are the main pore types, which could serve as storage space and seepage channels for shale gas with good connectivity. Shale pores are dominated by mesopores, followed by macropores, with pore diameters ranging from 1 to 50 nm. The specific surface area (SSA) is mainly provided by nanopores with diameters less than 5 nm, so that smaller pores make greater contribution to SSA and are more favorable for shale gas adsorption and accumulation, while SSA increases with increasing total pore volume. Our study further show that organic carbon content is the most important internal factor for controlling micro/nanopore development and SSA, particularly in controlling micro and mesopores. Moreover, increasing clay mineral content could enhance shale adsorption capacity, however, its controlling effect on pore volume and SSA is not obvious. The brittle mineral content mainly controls macropore development with negligible contribution to shale adsorption. For high and post mature shale, the order of organic pore development and specific surface area is type Ⅰ>type Ⅱ>type Ⅲ for different kerogen types.
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    Paleoclimate change reflected by element ratios of terrigenous sediments from deep-sea oxygen isotope MIS6 to MIS5 at MD12-3432 station in northern South China Sea
    QU Huaxiang,HUANG Baoqi
    2019, 26(3): 236-242. 
    DOI: 10.13745/j.esf.sf.2019.4.18

    Abstract ( 306 )   PDF (3228KB) ( 184 )  
    Some of the major and trace elements in marine sediments are closely related to the source area of sediments. The change of major and trace elemental ratio is affected by chemical weathering intensity in the source area. Therefore, the ratios can reflect paleoclimate change in the source area of marine sediments. In this work, we studied the major and trace elements of the sediments between Marine Isotope Stage (MIS) 6 and 5 in the core of MD12-3432 on the northern slope of the South China Sea. The elemental contents showed good climate control characteristics, with K/Ti, Mg/Ti, Al/Ti, Fe/Ti, Co/Ti, Zn/Ti and V/Ti ratios higher in MIS5 but lower in MIS6. The detrital materials in the northern South China Sea mainly came from southern China. The changes of elemental ratios in sediments showed increased chemical weathering of continental crusts in southern China during the interglacial period (MIS5), indicating warm and humid climate in the South China continent during this period, possibly a result of enhanced East Asian summer monsoon during the interglacial period. The chemical weathering of the source area in northern South China Sea weakened during the glacial period, in contrast to the strong East Asian winter monsoon and cold and dry climate in southern China. At the same time, the Ba/Ti ratio related to surface seawater productivity is higher in the interglacial and lower in the glacial periods, reflecting higher surface productivity during the interglacial period and relatively lower surface productivity during the glacial period in the northern part of the South China Sea. This may be due to increased surface productivity in the northern South China Sea, as increasing East Asian summer monsoon can bring more rainfall which may lead to enhanced chemical weathering on land and large amount of nutrients entering the South China Sea through river channels.
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    Excitation-emission matrix spectroscopic characteristics of dissolved organic matters and the significance in high arsenic groundwater research in the Guide Basin, China
    LIANG Mengyu,GUO Huaming,LI Xiaomeng,WANG Zhen,XIU Wei
    2019, 26(3): 243-254. 
    DOI: 10.13745/j.esf.2019.03.027

    Abstract ( 224 )   PDF (4831KB) ( 200 )  
    Dissolved organic matter (DOM) controls the mobilization of arsenic (As) in several ways. Although higher As concentrations were observed in confined vs. unconfined aquifers in the Guide Basin, the roles of DOM in As mobilization are unclear. In order to evaluate DOM influence on As mobilization in confined aquifer under reducing environment in the Guide Basin, we conducted excitation-emission-matrix spectroscopic (EEMs) analysis on surface water and groundwater samples and used parallel factor analysis (PARAFAC) to determine DOM properties. The PARAFAC model identified four components in the Guide Basin and they are all humics: C1 is terrestrial humic-like; C2 is humics and affected by agriculture; C3 is semiquinone-like; and C4 is microbial humic. C1 is highly enriched in groundwater at about 40%55%. Compared to groundwater, surface water has higher C2 and C3 contents. Meanwhile, high As confined aquifer is characterized by higher percentage of C2 and C3. The occurrence of high As groundwater in confined aquifer shows that C1 can form complex with As to increase aqueous As concentration; and C3 serves as an electron shuttle to enhance microbial reduction of iron oxides and As mobilization. The HCO-3 anion generated from organic matter degradation causes Fe(II) precipitation to form FeCO3 and adsorbs some of arsenic. These results demonstrate that DOM can lead to As accumulation in groundwater by complexation or by serving as electron shuttle to promote reductive dissolution of iron oxides. This finding provides an theoretical explanation for the formation of high arsenic groundwater in the upper reaches of the Yellow River.
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    Experimental studies of the effect of perovskite La0.5 Sr0.5 Co0.8 Mn0.2 O3-δ on tetrabromobisphenol A degradation in water by peroxy-monosulfate
    MAO Weida,HU Xiang
    2019, 26(3): 255-262. 
    DOI: 10.13745/j.esf.sf.2019.5.30

    Abstract ( 148 )   PDF (5482KB) ( 92 )  
    We carried out experimental studies of tetrabromobisphenol A (TBBPA) degradation by perovskite La0.5Sr0.5Co0.8Mn0.2O3-δ(LSCM82) and peroxy-monosulfate. We investigated in detail the effect of catalytic activity of perovskite prepared at different calcination temperatures on TBBPA degradation, and the effect of initial pH on the degradation efficiency of preferred catalytic system. The results show that the redox pairs of variable-valence metal ions Co3+/Co2+ and (Mn4++Mn3+)/Mn2+ were the major contributors to catalyst activation. At 950 ℃ calcination temperature, the catalytic reaction rate was higher for the catalyst aggregate LSCM82-950 that has proper oxygen vacancies and specific surface area. We found that degradation of TBBPA in water by LSCM82-950 activated monosulfate at neutral pH not only reduced cobalt leaching from catalyst, but also achieved maximum degradation.
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    Comparative study on the distribution characteristics and sources of heavy metal elements in PM1, PM2.5 and PM10 in Shijiazhuang City
    YAN Lina,ZUO Hao,ZHANG Juquan,LI Zhenning,LI Shengrong
    2019, 26(3): 263-270. 
    DOI: 10.13745/j.esf.2019.03.029

    Abstract ( 136 )   PDF (1718KB) ( 144 )  
    In order to investigate the pollution characteristics and sources of chemicals (especially heavy metals) in atmospheric particles of different sizes, we collected PM1, PM2.5 and PM10 samples from Shijiazhuang City in 2016. We determined the mass concentrations of 13 elements including Al, Ti, V, Cr, Mn, Fe, Cu, Zn, As, Sb, Hg, Pb and Cd by ICP-MS. We analyzed the distribution characteristics of these elements in PM1, PM2.5 and PM10 by the enrichment factor (EF) method, and discussed the main sources of these elements based on principal component analysis (PCA). The enrichment factor analysis showed that Al, Fe, Ti, and Mn were less influenced by human factors (EF<10), while other elements had significant to extremely strong human influences, especially Cd (EF>103). In addition, smaller particle size correlates with larger enrichment factor, indicating greater influence of human factors in small particles. Principal component analysis showed that there are three sources for the elements in PM1 and four for PM2.5 or PM10. The sources are mainly related to industrial activities, fossil fuel combustion, motor vehicle exhaust and wear, and garbage burning.
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    Thickness estimation of basalts in Mare Australe
    YAO Meijuan,CHEN Jianping,JI Jinzhu
    2019, 26(3): 271-281. 
    DOI: 10.13745/j.esf.sf.2018.12.11

    Abstract ( 160 )   PDF (5563KB) ( 191 )  
    Mare basalts were formed from partial melting mantle followed by volcanic eruption to the lunar surface. The thickness of mare basalt plays an important role in the study of magmatic process during Moons evolution and can reflect the depths of the mare basalts source region. It can help us understand the regional volcanism and provide the basic constraints for the thermal and/or magma evolution of entire Moon. Also, the thickness of mare basalt can be used to estimate basalt volumes and indicate the total amount of magma eruption and the thermal state of the Moon. In this paper, by using multi-source remote sensing data and combing the crater morphological characteristics with crater excavation method, we estimated the thickness of Mare Australe basalts in crater and intercrater and analyzed the area, volume, age and magmatic activities. The results showed that the thickness of basalts in crater ranged between 0.11 and 4.75 km with an average thickness of 1.32 km, and the total area and volume of exposed basalts were approximately 57.0610791.66 km2 and 10.2551260.38 km3, respectively. The thickness of basalts in intercrater was found to be 0.012.18 km with an average thickness of 0.34 km, and the total area and volume of exposed basalts were about 6487.8933170.55 km2 and 2711.9711609.69 km3, respectively. As a result, we estimated the thickness of basalts in Mare Australe to be 0.014.75 km and averaged at 600 m, and the total area and volume of exposed basalts to be approximately 2.12×105 km2 and 2.71×105 km3, respectively. By analyzing the ages and distribution characteristics of basalts, we found that the magma eruption activities were mainly concentrated between the Imbrian and Eratosthenian era, along with many localized multi-stage magmatic eruptions and filling processes in Mare Australe, which led to coexistence of the early and late stage basalt in a same basalt unit simultaneously, and the unique distribution characteristics of Mare Australe basalts are related to their topography.
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